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The opposite of straight could be crooked, curved, turned, or bent. The opposite of straight (honest) could be dishonest, devious, or corrupt. The opposite of straight (slang for heterosexual) would be gay.
The word straight does have an antonym, which is crooked. So perhaps a crooked line is the opposite of a straight line.
uneven, crooked
crooked , disproportional
A sphere has a total curved surface. A cylinder and a cone have a partial curved surface